

<style type="text/css">
.login{
   margin:100px auto;
   width:370px;
   padding:50px 50px;
   border:1px solid #ccc;
}

</style>
<div class="login">
      <form role="form">
     <div class="form-group">
       <label >邮箱</label>
       <input type="email" class="form-control"  placeholder="输入邮箱">
     </div>
     <div class="form-group">
       <label >密码</label>
       <input type="password" class="form-control"  placeholder="输入密码">
     </div>
     <button type="submit" class="btn btn-default">登陆</button>
   </form>
</div>


